Peripheral Nervous System (Part 2) Flashcards
(31 cards)
Mature neurons do not
divide
Damage to what causes the death of a neuron
the cell body
In Peripheral nerves, damaged axons
can successfully regenerate and new axons can grow 1-5 mm/day
Damaged axons in the peripheral nerves break down by
Wallerian degeneration (breaks down distally from injury site)
In peripheral nerves, the growth of axons can
be blocked by other tissues and thus stop regeneration
In the CNS axons, in reference to regeneration
do not regenerate more than 1mm
In the CNS axons, the growth of axons may be
able to reroute the nerve pathway
How many pairs of cranial nerves are there
12
Name the nerves with their numbers
1-Olfactory 2-Optic 3-Oculomotor 4-Trochlear 5-Trigeminal 6-Abducens 7-Facial 8-Vestibulocochlear 9-Glossopharyngeal 10-Vagus 11-Accessory 12-Hypoglossal
From the cerebrum to the upper nasal tract; sensory only for smell
Olfactory Nerve
from cerebrum to eyes; sensory only for vision
Optic nerve
what does the oculomotor nerve do
moves eyes and eyelid
What does the Trochlear nerve do and what is special about it
moves eye; the smallest cranial nerve
What does the Trigeminal nerve do and what makes it special
sensory (eyes, forehead, and mouth) and motor (chewing); largest cranial nerve
What does the Abducens nerve do
Abducts eyes (turns them laterally)
What does the facial nerve do
both sensory (taste) and motor (facial muscles, tear and salivary glands)
What does the Vestibulochochlear nerve do
Sensory only ( hearing and dynamic equilibrium)
What does the Glossopharyngeal nerve do
Sensory (mouth and taste) and motor (swallowing)
What does the Vagus nerve do
From Medulla Oblongota to chest and abdomen (motor)
~somatic= speech and swallowing
~autonomic= controls heart and abdominal smooth muscle
What does the Accessory nerve do
Motor (muscles in the neck and back)
What does the Hypoglossal nerve do
Motor (tongue for chewing, swallowing and speaking).
How many spinal nerves are there
31 pairs along the spinal cord, they are mixed nerves (sensory and motor)
What is the break down of the spinal nerves
8 cervical, 12 thoracic, 5 lumbar, 5 sacral, and 1 coccygeal
What is the purpose of the spinal nerves
They transmit impulses between the spinal cord and the rest of the body
